A garage conversion turns your existing garage into a legal, permitted living space. Most often that means an ADU (accessory dwelling unit), a self-contained rental or family unit with its own kitchen and bath. It is usually the fastest, lowest-cost way to add a unit to a San Diego lot, because the foundation, walls, and roof are already there. Proactive Edge Developments is a CSLB-licensed San Diego general contractor (license #768545), voted Best of Houzz ten years running.
Convert your existing garage into a fully permitted, rentable accessory dwelling unit at a fraction of new-build cost.
Because the structure exists, garage conversions are typically the most affordable path to added square footage in San Diego.
We handle egress, fire separation, utilities, and all San Diego permitting requirements for a legal conversion.
Visualize your converted space before construction begins — included free for every new client.
At 3680–3682 Curlew St in San Diego, we converted the garage into a separate unit and added a second story to the main house. The owner ended up with two distinct, rentable addresses on one lot.
The converted garage at 3680 Curlew St now has:
Garage conversions usually cost far less than a new detached ADU, because you reuse the existing slab, walls, and roof. Published San Diego figures:
| Measure | Figure | Source |
|---|---|---|
| Typical all-in garage conversion (2026) | $80,000 – $210,000 | Dwelling Index, 2026 |
| Median construction value declared on City of San Diego 2026 conversion permits | $89,600 (middle half: $59,600 – $144,400). Excludes design, fees, and utilities | sandiegoaducost.com, City permit data |
| Median declared value for a new detached ADU, for comparison | $154,300 | sandiegoaducost.com, City permit data |
What moves the price:
Use our free project calculator (choose "Garage Conversion") for a ballpark. Then book a free on-site estimate for a real number before any work starts.
Yes. A legal conversion needs a building permit, and permit-free garage conversions are a common problem when a home is sold. Each jurisdiction has its own rules: the City of San Diego, Carlsbad, Encinitas, and unincorporated County areas all differ. The City of San Diego publishes its requirements in Information Bulletin 400. We prepare the plans, submit them, respond to city corrections, and manage inspections through final sign-off.
Losing the garage parking: California ADU law limits when a city can require replacement parking for a garage converted into an ADU. We will confirm the rules for your address during the consult.
While your conversion plans are in city review, we can start permit-light work on the main house, like a kitchen or bath remodel, so your project never sits idle. When the plans clear, the crew moves straight into the conversion.
We convert garages across San Diego County. That includes North Park, Clairemont, Point Loma, Pacific Beach, La Jolla, La Mesa, El Cajon, Escondido, Carlsbad, Encinitas, and nearby communities.
Thinking bigger? See our ADU builder page for detached ADUs and second-story additions.
Every new client gets one free 3D rendering, made with our in-house design software — so you see the finished result before a single nail goes in.
Published 2026 ranges put typical all-in garage conversions at about $80,000–$210,000. City permit data shows a median declared construction value of $89,600, before design, fees, and utilities. We give you an exact written number after a free on-site estimate.
It depends on city review time and scope, and we give you a written schedule with your estimate. Under California law (Gov. Code §66317), when there is already a home on the lot, the city has to approve or deny a complete ADU permit application within 60 days. Conversions usually take less construction time than a new detached ADU, because the structure already exists.
Yes. A legal, rentable conversion needs a building permit and city inspections. We handle the plans, the submittal, and the inspections.
A permitted garage ADU can usually be rented long-term. Short-term rental rules vary by city, so we check them for your address.
California ADU law limits when a city can require replacement parking for a garage converted into an ADU. We confirm the rules for your property during the consult.
Yes. Proactive Edge Developments holds CSLB license #768545 (Class B, General Building) and is fully insured and bonded.
Tell us about your project and we'll create one free 3D rendering with our in-house software, plus a free on-site estimate. No cost, no obligation.
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